What desktop environment / session do you use? I'm not seeing that in the default GNOME/X11 session on 18.04 (there's no menu bar there, either).
Can you please run the following command to attach additional information to the bug report? apport-collect 1804853 Thanks! ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1804853 Title: firefox menu button stops working after update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1804853/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs